Bug 2501850 (CVE-2026-47180) - CVE-2026-47180 zeroconf: Zeroconf: Denial of Service via crafted mDNS packets
Summary: CVE-2026-47180 zeroconf: Zeroconf: Denial of Service via crafted mDNS packets
Keywords:
Status: NEW
Alias: CVE-2026-47180
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2508069
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-17 19:02 UTC by OSIDB Bzimport
Modified: 2026-07-28 17:34 UTC (History)
7 users (show)

Fixed In Version:
Clone Of:
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Last Closed:
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Description OSIDB Bzimport 2026-07-17 19:02:21 UTC 
Zeroconf is a pure Python implementation of multicast DNS service discovery. Prior to 0.149.5, DNSIncoming._decode_labels_at_offset recurses once per DNS-name compression pointer, and a single mDNS packet carrying chained pointers can trigger a RecursionError that escapes DNSIncoming.__init__, causing sustained CPU burn, log flooding, and degraded mDNS-dependent features for unauthenticated hosts on the local link over UDP/5353 (224.0.0.251 / ff02::fb). This issue is fixed in version 0.149.5.
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